Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bcc8d8906d6f787…

MALICIOUS

PDF

34.5 KB Created: 2020-08-01 16:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c217d9c6eb97d005a2772aaf330cbe5d SHA-1: 4fcbe761006aa492bcbe5a7b2dfb89282fc1f344 SHA-256: 8bcc8d8906d6f7879ebba8d9252161cd1b7cd8408fcad505f9ec1146e836812d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a solutions manual, aiming to trick users into clicking it. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, common in SEO poisoning attacks. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=university+calculus+alternate+edition+solutions+manual+pdf
    • http://files.theaterleagueofclifton.com/uploads/1/3/0/9/130968968/xapokix-folidajev-molev.pdf
    • http://files.thekansasbeecompany.com/uploads/1/3/1/4/131454151/xuxupijubi.pdf
    • http://files.ppmglobal.services/uploads/1/3/1/4/131437445/lizibajitakiwi-memos.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/87393744573.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/fiximukero.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/julubivej.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/93858229941.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5354/files/pisulemavu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7873/0403/files/backup_bookmarks_firefox.pdf
    • https://cdn.shopify.com/s/files/1/0437/5917/3790/files/pokemon_ruby_fossils.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0431/3268/2397/files/xutavitumobugipu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6004/3682/files/29671580918.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048a2.bin
4215b91cb99261c85082d896e07092e66e73d43253faaae34a3eafb4738aed42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48A2 5452 bytes
font_01_sfnt_off00005b29.bin
7946c5eb3117f24127b2982d0524cae8c19e0738347284f1cbc8fa209993b217		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B29 9956 bytes

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